| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for mounting a valve disk to a valve shaft, allowing maintenance management to be performed easily.SOLUTION: A butterfly type steam valve 1 includes a valve body having a flow path through which steam flows, a valve shaft 3 rotatably supported by the valve body, and a valve disk 4 rotating together with the valve shaft 3 inside the flow path. In the valve shaft 3 and the valve disk 4, a pin 11 is removably press fit. The pin 11 penetrates through the valve shaft 3 and the valve disk 4 toward the diameter direction of the valve shaft, and a screw part, exposed out of the valve disk 4, is formed in an end of the pin 11. A nut 16 is screwed into the screw part of the pin 11. The nut 16 holds the pin 11 in the valve shaft 3 and the valve disk 4 and has a flange part 17 projected over the circumference of the nut 16. An engagement part 26 covering the flange part 17 of the nut 16 is arranged in the valve disk 4, and the nut 16 is held in the valve disk 4 via the engagement part 26. |
